Voters

Between the last general election in May 2015 and December 2015 the Electoral Register lost just under 2 million (1,913,116) registered electors.

Between December 2015 and June 2016 the Electoral Register gained just over 2 million (2,035,933) registered electors.

The net change between the last general election in May 2015 and the EU Referendum in June 2016 is (only) 122,817 registered electors.

The Scottish and the Welsh seem to be unenthusiastic democrats, unless, of course, many are fleeing the jackboots of their respective 'assemblies'.

A bit of a puzzle. Even the National Health Soupkitchen (a.k.a Envy-of-the-World™) is unlikely to kill off two million people within six months.
Of those whom the Envy-of-the-World™ left alive, did they emigrate to a more rational country? or perhaps just change their address?
Are most of the two million who registered in the first six months of this year and replaced them just gormless yoof?

We will soon (in about 12 hours) find out…

Data (Electoral Commission)

Electoral register: May 2015, December 2015, June 2016

For the purposes of comparison, Gibraltar (24,117), which only appears in June 2016, has been removed from all the figures.